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Atomic clocks run at the same speed over millions of years, but the earth very gradually slows down spinning on its axis. So in order to keep clocks accurate in time, every so often a second is added. Twenty-four seconds have been added since 1972, but our days are not 24 seconds longer. The seconds are added only to the date in which they are inserted. For more information click here and click here. What did you learn today?
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